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Course: Precalculus > Unit 2
Lesson 10: Using trigonometric identitiesUsing trigonometric identities
Trigonometric identities like sin²θ+cos²θ=1 can be used to rewrite expressions in a different, more convenient way. For example, (1-sin²θ)(cos²θ) can be rewritten as (cos²θ)(cos²θ), and then as cos⁴θ. Created by Sal Khan.
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